Heating apparatus



Fes'a. 1, 1944. E. J. DlLLMAN HEATING APPARATUS Filed March 27,- 1943 T0 RADIATORA +FROM RADIATOR INVENTOR 2 K v z 4w, ATTORNEY Patented Feb. 1, 1944 2,340,844. HEATING APPARATUS Earnest J. Dillman, Detroit, Mich, assignor to Detroit Lubricator Company, Detroit, Mich, a

corporation of Michigan Application March 27, 1943, SerialNo.489,816

Claims.

'for domestic hot water from a heat exchanger heated by the boiler.

Another object is to directly influence the operation of such a means upon the supply of do- .mestic hot water by the heat exchanger.

The foregoing and other objects will be apparent from the following specification.

The invention consists in the cooperative rela- N tion of parts to be more fully described hereinafter and the novelty of which will be particularly pointed out and distinctly claimed.

In the accompanying drawing, to be taken as a part of this specification, there is fully and clearly illustrated a preferred embodiment of the invention in which drawing:

Figure l is a view of'a heating apparatus'partially diagrammatic and having certain parts broken away to more .-clearly show the invention;

'Fig. 2 is an enlarged detail view in section of a thermostatic controlvalve forming part of the invention.

Fig. 3 is a detail view in perspective showing the heat exchange .relation of certain conduit members, and

Fig. 4 is a detail view in section showing a modification of a part of thecontrol valve.

Referring to the drawing by characters ofreference, -l designates generally a hot water boiler having a hot water supply line or pipe 2 forsupplying the heated boiler-water to the usual house heating radiator, for example. The return line 3 from the radiator connects into the boiler .l in the usual manner, as at 4, and is provided with a pump or hot water circulator 5 driven by an electric motor 6. A room thermostat i responsive to the temperature of the air in the space heated by the radiator controls the electric circuit through lead wires 8, 9 of the motor 6. The boiler l is heated by an oil burner or the like 10 having its operating circuit ll, 12 controlled by a thermostatic switch l3 responsive to the temperature of the water in the boiler l.

a =by-pass pipe ;28,,.see Fig. ,thewater spaceof theboiler l,;asat.29, at a poin t Positioned in the return line 3 on the inlet'side of the circulator 5, there is a thermostatic valve l4 havinga casing or housing 45 with an inlet 16 and anoutlet I]. I controllin flow from the inlet Hi to the-outlet .l'l and tothecirculator 5, there is a Valve mem- .ber I8 of the butterfly type pivqta y pp rt at I19 andoperated by a thrust member 20.v The casing l5 has an extension Zlprovidinga chamber :22 in which a temperature responsivepper atingelement23 is positioned. Abraclret 24 carried by the casing .I 5supports a housing which carries the element 23, whichis preferably a device such as is disclosed in the patent tQ Vernet, 2.265586, December .9, 1951i. Within the housing 25 z-there is a spring ,2t-acting on the thrust member 20 and urging the valve member toward .closed position. The chamber 22 has aninlet 21. Surrounding the supporting vmember. 25

there isa bafiie member 28;having ports 28 and operable to restrictanddirect flow from the inlet 21 into intimate heat exchange relation with the element 23.

Connected to the inlet 21 there is 1,-whichconnects into closely adjacent to the coils of a domestic water supply heat exchanger 3i) and preferably at va point directl beneath the exchanger, so as to receive-the boiler waterwhioh has been cooledby down .flow convection circulation over the coils of the heatexchanger 30. The pipe v 28. adjacent its outlet from the boiler is extended into inti- -mate heat exchange relation, as at 3l,,with,'the

cold water inlet line or pipe 32, which feedsthe exchanger 30. This exchange relation ispreferably provided by clamping thepipe" .28 tofthe inlet 1ine.3 2 by a clamp ,3.3, s ee 3. Theexchanger 30 has ;a.-ho,t --,w ater outlet; line .34 leading to the usual points of consumption of the,;do mestichot water supply. The pipe vZiland cham- 'ber 22 provide aby-pass conduit-forthe-boiler water to convey the same into in-timate heat exchange-.-relation with the,ternperature responsive .elementlt. ln Figl l, the outletfrom thecham- -ber 22 to the .outlet .1 and the' circulator f is rough a p t s3 t e isl .w l i h c'h m- @ber 22. In this form of device, the-baffle plate 36 is imperforate and substantially fits the opening of the chamber 22 into the casing l5 so that flow from the inlet H to the chamber 22 is directed over the temperature responsive element 23.

The operation of the apparatus is as follows. The boiler thermostat I3 is set to maintain the boiler water temperature at say F., so that whenever the room thermostat 1 calls for heat Within the casing t5 and and closes the circuit of the circulator motor 6, water, which should be at the desired radiator heating temperature, will be supplied through the conduit 2 to the radiator, the water being withdrawn through the return line 3 to the boiler, assuming that the valve I8 is open. If the water drawn by the circulator 5 through the by-pass pipe 28 is below the desired domestic water heating temperature, say 150 F., for which the thermostatic valve I4 is set, then the temperature of the water drawn by the circulator over the element 23 will be below the temperature at which valve I8 will be opened and accordingly spring 26 will be holding the valve l8 in closed position, with the result that the circulator 5 will not supply water to the radiator and heating of the boiler water will continue without lowering of its temperature by supply to the radiators. the temperature of the water drawn through the bypass pipe 28 by the circulator reaches the desired minimum temperature of 150 F. for heating the domestic water in the exchanger 30, then the operating element 23 will act through the thrust member 20 against the force of spring 26 and move the valve Hi to open position, so that circulation of water to the radiator will occur. If while the circulator 5 is in operation domestic hot water is drawn from the exchanger 30 through pipe 34, so that cold water is supplied to the exchanger through the inlet pipe 32, then the boiler water adjacent the exchanger 30 will be cooled and the temperature of the water supplied to the pipe 28 from the boiler will decrease. If the temperature of the water supplied by pipe 28 to the element 23 falls below the temperature at which element 23 holds the valve H3 in open position, then the spring 26l Will move the valve l8 to closed position so that the boiler water will be utilized exclusively to heat the exchanger 30 to provide hot water for the domestic supply. By extending the pipe 28 in intimate heat exchange with the cold water inlet pipe 32, the operating element 23 will respond more quickly to the withdrawal of domestic water from the exchanger 30 and more quickly close the valve [8. As soon as the withdrawal of water from the exchanger 30 is stopped, the temperature of the water supplied to the pipe 28 will increase, and when it reaches the domestic water heating temperature, the valve l8 will again be opened by the element '23. The cooling of .the water sup plied through pipe 28 by the heat exchange from inlet pipe 32 is quickly overcome, fOIIOWiIlg'StOP- page of withdrawal of water from the ex changer, by reason of heat conduction from the boiler water through the pipe 32 to the point of heat exchange relation with the pipe 28.

What is claimed and is desired to be secured by Letters Patent of the United States is:

1. A heating apparatus comprising a hot water boiler having supply and return lines for a hot water radiator, a circulator in the return line to the boiler, a thermostatic valve having a'temperature responsive operating element and positioned in the return line to control flow to the jcirculator, and a by-pass conduit leading from said boiler to said return line in heat exchange relation with said operating element.

2. A heating apparatus comprising a hot water boiler having supply and return lines for a hot water radiator, a circulator in the return line to the boiler, a thermostatic valve having a temperature responsive operating element and positioned in the return line to control flow to the circulator, a domestic water supply heat exchanger in said boiler and having a cold Water inlet line, and a by-pass conduit leading from When I said boiler to said return line in heat exchange relation with said operating lement, said by-pass conduit having heat exchange relation with said inlet line anterior to its exchange relation with said element thereby to influence said element by the temperature of said inlet line.

3. A heating apparatus comprisin a hot water boiler having supply and return lines for a hot water radiator, a circulator in the return line to the boiler, a thermostatic valve having a temperature responsive operating element and positioned in the return line to control flow to the circulator, a domestic water supply heat exchanger in said boiler, and a by-pass conduit leading from said boiler adjacent said exchanger and opening into said return line between said circulator and said valve, said conduit conveying boiler water in heat exchange relation with said operating element so that said element will be influenced by the temperature of said exchanger.

4. A heating apparatus comprisin a hot water boiler having supply and return lines for a hot water radiator, a circulator in the return line to said boiler, a valve casing in said return line on the inlet side of said circulator, a valve member in said casing and controlling flow to said circulator, said casing having a chamber communicating with said return line on the outlet side of said valve member, a temperature responsive operating element for said valve and positioned in said chamber, and a by-pass pipe leading from said boiler to said chamber for flow of boiler water in heat exchange relation with said element upon operation of said circulator.

5. A heating apparatus comprising a hot Water boiler havin supply and return lines for a hot water radiator, a circulator in the return line to said boiler, a valve casing in said return line on the inlet side of said circulator, a valve member in said casing and controlling flow to said circulator, said casing having a chamber communicating with said return line on the outlet side of said valve member, a temperature responsive operating element for said valve and positioned in said chamber, a domestic water supply heat exchanger in said boiler and having a cold Water inlet line, and a by-pass pipe leading from said boiler adjacent said exchanger to said chamber for flow of boiler Water in heat exchange relation with said element upon operation of said circulator, said pipe having intimate heat exchange relation with said inlet line so that said element will be influenced by the temperature of said inlet line.

EARNEST J. DILLMAN. 

